For example I have 2 wiki pages. First page includes such keywords as AD.180, AD.159, AD.200, second page includes keywords AD.300, AD.180, AD.159. If I search for AD.300 it displays me all pages which have AD before the number. Search doesn't take the AD.300 as a whole word, it searches for everything what has AD, not only AD.300.

This helped me a little, thanks. But if I have AD.180 in one page and AD 180 in another and if I search "AD.180" it still find me both pages, not the one where AD.180 is written.
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user3529236Aug 6 '14 at 8:56

1

Than I guess you have to use OR function "AD.180" or "AD 180"
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el94Aug 6 '14 at 8:58